Cartier, Ballon Bleu series, model: W69012Z4, automatic mechanical, stainless steel, diameter: 42.1 mm • Appearance and configuration: Stainless steel bezel without diamonds, grooved stainless steel crown set with one cabochon synthetic spinel; The silver-plated guillose-patterned dial is complemented by Roman numeral hour markers and sword-shaped blue steel hands. The crystal is made of anti-reflective sapphire crystal • Bracelet and clasp: Integrated stainless steel metal bracelet, paired with a stainless steel folding clasp. The case back is a solid design. It is equipped with the Cartier Cal.049 automatic mechanical movement, with the base movement being ETA 2892-A2. The diameter is 25.6mm, the thickness is 3.6mm, the frequency is 28,800 vibrations per hour, it is powered by 21 jewels, and the power reserve is approximately 42 hours • Core functions: Basic hour, minute and second timekeeping + calendar display, no additional complex functions